Quote:
Originally Posted by Popcorn
Lol Idk the upside down ink looks darker to me. A densitometer would be able to tell if it was printed at the same time as the rest of the ink.
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The 150's with that factory 649 had the red bar and factory 649 line printed later to make factory 30 cards ok to issue from factory 649. (The issuing factory had to be on there by federal law. )
An inverted overprint like that is really very interesting.